import tkinter
import time
import random
class Ball():
    def __init__(self,canvas,paddle,score,color):
        self.canvas=canvas
        self.paddle = paddle
        self.score = score
        self.id =canvas.create_oval(0,0,15,15,fill=color)
        level=[-9,-7,-5,-3,-1,0,1,3,5,7,9]

        canvas.move(self.id,254,100)
        self.x=random.choice(level)
        self.y=random.choice(level)
        self.hit_bottom=False
    def draw(self):
        canvas.move(self.id,self.x,self.y)
        pos = canvas.coords(self.id)
        if pos[3]>=600:
            self.hit_bottom=True
        if pos[1]<=0:
            self.y=3
        if pos[2]>=600:
            self.x= -3
        if pos[0] <=0:
            self.x = 3
        if self.hit_paddle(pos)== True:
            self.y=-3
    def hit_paddle(self,pos):
        paddle_pos=self.canvas.coords(self.paddle.id)
        if pos[2]>=paddle_pos[0] and pos[0]<=paddle_pos[2]:
            if paddle_pos[3]>=pos[3] and pos[3]>= paddle_pos[1]:
                self.x=self.x+self.paddle.x
                self.score.hit()
                return True
        return  False


class Paddle():
    def __init__(self,canvas,color):
        self.canvas=canvas
        self.id =canvas.create_rectangle(0,0,100,10,fill=color)
        canvas.move(self.id, 145, 450)
        self.x=0
        self.y=0
        self.canvas.bind_all('<KeyPress-Left>',self.turn_left)

        self.canvas.bind_all('<KeyPress-Right>',self.turn_right)

        self.canvas.bind_all('<Button-1>', self.game_start)
        self.start=False
    def game_start(self,evt):
        self.start= True

    def draw(self):
        canvas.move(self.id,self.x,self.y)
        pos = canvas.coords(self.id)
        if pos[3]>=600:
            self.y=-5
        if pos[1]<=0:
            self.y=5
        if pos[2]>=600:
            self.x= -0
        if pos[0] <=0:
            self.x = 0
    def turn_left(self,evt):
        self.x=-3
    def turn_right(self,evt):
        self.x =3
class Score():
    def __init__(self,canvas,color):
        self.canvas = canvas
        self.score=0
        self.id = canvas.create_text(550, 50, text=self.score, font=("Arial",20), fill=color)
    def hit(self):
        self.score=self.score+1
        self.canvas.itemconfig(self.id,text=self.score)

tk=tkinter.Tk()
tk.title("弹球")
tk.resizable(0,0)
tk.wm_attributes('-topmost',1)
canvas=tkinter.Canvas(tk,width=600,height=600)
canvas.pack()
tk.update()

game_over_text=canvas.create_text(300,300,text='Game over',font=("Arial",30),state='hidden')
paddle = Paddle(canvas,"blue")
score = Score(canvas,"red")
ball = Ball(canvas,paddle,score,"red")
while 1:
    if ball.hit_bottom == False and paddle.start == True:
        ball.draw()
    if ball.hit_bottom == True:
        canvas.itemconfig(game_over_text,state='normal')
    paddle.draw()
    tk.update_idletasks()
    tk.update()
    time.sleep(0.01)
